In the figure shown, light waves A and B both of wavelength lambda are initially in phase and travelling rightward as incident by the two rays. Wave

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In the figure shown, light waves A and B both of wavelength lambda are initially in phase and travelling rightward as incident by the two rays. Wave A is reflected from four parallel surfaces but ends up travelling in original direction. The possible value(s) of distance L in terms of wavelength lambda in figure which put A and B exactly out of phase with each other after all the reflected is/are

A. lambda//2
B. 3lambda//2
C. 3lambda//4
D. lambda

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